/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.contrib.streaming.state;

import java.io.Closeable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import static org.apache.flink.runtime.concurrent.Executors.newDirectExecutorService;

/**
 * Data transfer base class for {@link RocksDBKeyedStateBackend}.
 */
class RocksDBStateDataTransfer implements Closeable {

	protected final ExecutorService executorService;

	RocksDBStateDataTransfer(int threadNum) {
		if (threadNum > 1) {
			executorService = Executors.newFixedThreadPool(threadNum);
		} else {
			executorService = newDirectExecutorService();
		}
	}

	@Override
	public void close() {
		executorService.shutdownNow();
	}
}
